Mathnasium 28W Crystal Lake Plaza, Crystal Lake IL 60014 (815) 526-3453

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Open for @Home Learning and In center Learning

Our Team

Our specially trained math instructors will teach your child how to understand math in an individual setting; our unique approach enables us to explain concepts really well and lend a helping hand to every student. Our tutors foster a caring, encouraging environment that helps kids thrive and learn! Read below to learn more about our talented team:


 Jake Kohlhaas,  Center Director 

Jake graduated from Mchenry County College with an Associates in Science. His plan is to transfer to Northern Illinois University to get his Bachelor’s in Education. Jake has a great love for music: he sings, plays guitar, bass, drums, ukelele, and piano. Jake has been working at the Crystal Lake location since the center opened in April 2014 and has been in the role of Team Leader for the last two years, before being promoted to Center Director.  Jake specializes in Geometry and has tutored every Geometry student at the Mathnasium of Crystal Lake. His favorite number is 942. His favorite thing about working at Mathnasium is seeing the growth of students over time. He says there is no better feeling than seeing a student who was failing in math start consistently receiving As in a subject that used to trouble them so much. He works hard to make a positive impact on the life of every student that walks into Mathnasium. 

 Mike & Joanna Ammer, Owners


As the Fixed Operations Director for two large successful Chevrolet dealerships and multiple Import dealerships in Illinois and Indiana, Michael has always had an active interest in mathematics. He began his 32-year career in the automotive industry as a car porter and through hard work and determination, became the Director of Fixed Operations successfully managing all aspects of the Service, Parts and Collision centers within the two dealerships. Joanna has been in the Veterinary Industry for over 25 years working as Hospital Operations Manager in both private, corporate, and non-profit veterinary practices. Michael and Joanna have four children of their own, two of which struggled with math, and had Individualized Learning Plans in school. They understand firsthand how this can affect the entire family and only wish that Mathnasium was in this area at the time their children needed extra help. After researching the Mathnasium method and learning how it could benefit children Michael and Joanna made a decision to open their own learning center which meant a career change for Michael. As scary as that was, they knew that parents and students in Crystal Lake and the surrounding areas would benefit from this endeavor. They found there were no other Math learning centers in the area and made a decision to locate their Mathnasium center in the heart of Crystal Lake. One of their goals is to create a center where students experience how much fun math can be and realize the potential that math skills can unlock. Michael and Joanna believe the Mathnasium method will deliver on this goal. They realized that opening a Mathnasium center would allow them to combine their love of children and math while providing a valuable service to the community. They are focused on hiring and supporting only the best math instructors, and look forward to helping children in the area continue to improve and excel in math proficiency and develop a strong sense of numbers. For them, the best part of working with children is seeing the joy in their eyes when they finally get to that "AHA" moment, after grasping the simple concept behind that tough looking math problem.



 Blake Hill, Instructor

Blake is a graduate from Northern Illinois University with his Bachelor's Degree in Mathematics with an emphasis on Education. He is currently looking to become a high school math teacher. He is very passionate about mathematics and was originally on track to become an engineer, but changed career paths not long after starting his job here.  He loves working with kids and his favorite part of the job is the fulfillment when reaching a breakthrough with a student. 

 Zach Dermont, Lead Instructor


Zach is a finance graduate for University of Iowa, though he grew up here in Crystal Lake. He started as an instructor, but was quickly promoted to Lead Instructor within his first year of working at Mathnasium. Besides math, Zach enjoys hiking, kayaking, and biking. He has four younger sisters, spanning from eleven to twenty four years old. Zach loves to make people laugh, and has a passion for teaching others.



Weston Sterchi, Instructor

Weston is a 2017 graduate and valedictorian of Crystal Lake Central High School and currently attends the Illinois Institute of Technology. He plans to earn a Bachelor of Science in Applied Mathematics and Master of Mathematical Finance by spring 2021. In high school, he took both AP Calculus BC and AP Statistics. His first year of college included coursework in multi-variable calculus, differential equations, linear algebra, discrete mathematics, and computational mathematics. In addition to helping students understand math, Weston enjoys running and spending time with his family.


 Teagan Reece, Instructor

Teagan is a college graduate from the University of Iowa, where she received her degree in Communication Studies. During the school year, she also works as a Pre School Teacher. She loves animals, especially her German Shepard Elvis. She also enjoys helping people, and being outside. Her plan is to eventually go back to school to become a High School science teacher. 


 Aiden Keck, Instructor

Aiden is a sophomore at Crystal Lake Central High School. He skipped a grade so this year he will be taking BC Calculus. He spends his free time writing code, making video games, and exercising. His favorite thing about Mathnasium is getting to teach students concepts that they've never seen before.

 Sydney Blake, Instructor

Sydney is a senior at Crystal Lake South High School. At South, Sydney has been involved with  NHS, Robotics Team, Speech Team, Track and Field and Tennis. In her free time she enjoys hanging out with friends, playing chess and cooking. This upcoming school year she will be enrolled in AP Calculus BC. Sydney plans to study engineering in college. Her favorite part of Mathnasium is being able to spread her love of math with other students and help them achieve their goals. 



Natalie Volling, Instructor


Natalie is a junior at Crystal Lake Central High School. At CLC Natalie is a member of the Math Team, Scholastic Bowl, Student Council, NHS and SNHS, and band. Natalie has a great enjoyment for reading as well as math. She is currently enrolled in Precalculus. She plans on getting a degree in actuarial science. One of Natalie’s favorite parts of working at Mathnasium is that she has the opportunity to help a student understand a concept that they have not understood before and seeing the look of joy on their face when they are able to do it without any help.



 Paul Lim, Instructor

Paul is a junior currently enrolled at Prairie Ridge High School. He competes with his school's math and WYSE team, and participates in both the Prairie Ridge Drumline and the Crystal Lake Strikers community drumline. Paul is taking Calculus BC, and has taken AP Chemistry and AP Computer Science. He likes all aspects of math, but particularly enjoys geometry. His favorite part about working at Mathnasium is being able to help a student find multiple ways to think about a problem.



 Jackson Singleton, Instructor


 Jackson is currently a senior at Crystal Lake South High School. He has taken AP Calculus and is currently taking a statistics class. In his free time, he enjoys being involved with theatre. He is currently the section leader of the Saxophone section of his school's band. Jackson is the only Instructor who actually started as a student.



 William Salvia, Instructor

Will is an incoming junior at Crystal Lake South High School. He is a member of the school's Science Olympiad team and plans to join Math Team next year. He is enrolled in AP Calculus BC this upcoming year. He loves science, especially biology, and plans to major in molecular and cellular biology. His favorite part of working at Mathnasium is working with kids in order to help them become more confident in their math abilities so that they can work on their own and move forward. 



 Shimin Yunker, Instructor

Shimin has just finished her freshman year at Crystal Lake Central High School. At school, she participates in band, choir, theatre, Math Team, and Science Olympiad. She has been in advanced in math since elementary school and will be enrolled in Precalculus next year as a sophomore. Shimin has always enjoyed and understood math but plans to study analytical and/or forensic chemistry in the future. At Mathnasium, she enjoys helping kids understand foreign concepts and loves watching them as they grow and learn from their mistakes.